# LeetCode - 0961. N-Repeated Element in Size 2N Array
### 題目網址：https://leetcode.com/problems/n-repeated-element-in-size-2n-array/
###### tags: `LeetCode` `Easy`

/*
    -LeetCode format-
    Problem: 961. N-Repeated Element in Size 2N Array
    Difficulty: Easy
    
    by Inversionpeter
*/



class Solution {
public:
    int repeatedNTimes(vector<int>& A) {
        bool counts[10000] = {};
        for (int &i : A) 
            if (!((counts[i] ^= 1) & 1))
                return i;
        throw NULL;
    }
};